@article{DAN_1975_221_6_a0,
     author = {A. L. Brahman},
     title = {On the adjunction of a boundary to a regular covering of a closed manifold},
     journal = {Doklady Akademii Nauk},
     pages = {1249--1252},
     publisher = {mathdoc},
     volume = {221},
     number = {6},
     year = {1975},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1975_221_6_a0/}
}